Rifts (Score 2, Interesting)

I played Rifts for a few years after it came out. True, the mechanics were fairly complicated, but that was half of the fun. The setting is something that would fit great in a MMORPG: a post-apocalyptic, dystopian, cyberpunk, western, fantasy setting.

BTW: Jerry Bruckheimer was also in talks to make a movie set in the Rifts universe at one point.